My MSc thesis "A Study on Virtualization and Energy Efficiency Using Linux".
I once figured out how to use a generic 3G USB modem with a DD-WRT flashed router using pppd and chat. I wrote the instructions in Finnish. The modem manufacturer gave me a free router as thanks and posted the instructions on their site also.
When I was getting into coding as a teenager, I wrote a 2.5D Pong clone with a nice tracker music soundtrack. It's called Super Winball. It's a Windows game and still quite fun I think.